Help with Roller Bearings specifications:

Cylindrical roller bearings have high radial load capacity and moderate thrust loads. They contain rollers that are cylindrical in shape. The rollers are not true cylinders; they are crowned or end relieved to reduce stress concentrations. This geometry translates to low friction and high-speed applications. Cylindrical roller bearings are commonly available in precision grades (RBEC-5). Lubrication for cylindrical roller bearings is usually oil, which also serves as a coolant.

Cross roller bearings consist of rollers with an axis of rotation that is alternately crossed between a split outer ring and an inner ring. These bearings are capable of handling complicated loads (radial, thrust and moment loads).

Tapered roller bearings consist of an inner ring (cone), an outer ring (cup), a cage and rollers which are profiled to distribute the load evenly across the roller. They have high radial and axial (thrust) load capacity at low to intermediate speeds. The thrust load capacity for single-row tapered bearings is about 60% of the radial capacity.

Two-row or double-row tapered roller bearings have increased radial load capacity compared to single-row bearings. They can also handle thrust loads from both directions. The rollers can be configured in a converging or a diverging orientation. In converging double-row tapered bearings, the contact lines of the rollers to the races converge towards the axis of the bearing rotation. This style does not appreciably increase the rigidity of the shaft mounting. In diverging double-row tapered bearings, the contact lines of the rollers to the races diverge towards the axis of the bearing rotation. This style increases the rigidity of the shaft mounting. Different configurations are also available with a single outer ring and two inner rings or two outer rings and a single inner ring.

Spherical roller bearings are self-aligning, double-row, combination, radial and thrust bearings. The rolling element is a spherical or crowned roller. The outer ring has a spherical race that allows for some misalignment of the shaft and housing. They are unequalled in their capacity for high loads and tolerance to shock loads, but have limited speed capabilities.

Spacer bearings are two single-row bearings purchased as a matched set. These bearings can be assembled together with the addition of spacers between the inner rings, the outer rings or both the inner and outer rings.

Cylindrical roller thrust bearings consist of a roller and cage assembly. They can be assembled against hardened flat surfaces or with hardened thrust washers. They tolerate much higher loads than thrust needle roller assemblies.

Spherical roller thrust bearings have a spherical raceway in the outer ring. The rollers are arranged diagonally in single row. Spherical roller bearings have a high axial load capacity and can take moderate radial loads (when an axial load is applied). Due to the nature of the spherical rollers, they can handle some misalignment.

Tapered roller thrust bearings have conically-shaped (tapered) rollers and are designed for heavy axial load applications. Tapered roller thrust bearings are available with a cage or in a full complement design.

Hollow roller bearings are single-row or double-row radial bearings with an inner ring, an outer ring and hollow or thin-wall rollers. The thin wall in the rollers allows these bearings to be preloaded, as opposed to cylindrical roller bearings with solid rollers. This increases radial stiffness and reduces radial vibration and radial run out. Proper lubrication is critical for proper operation and bearing life. These bearings are used on turbine shafts as well as grinding, milling and workhead spindles where precision and stiffness are a requirement.

Needle roller bearings are cylindrical roller bearings where the rolling element is long and thin relative to its diameter. These bearings have low cross sections but high radial load carrying capacity. This type has an outer ring, needle rollers, and a cage, but no inner ring.

Needle roller bearings are cylindrical roller bearings where the rolling element is long and thin relative to its diameter. These bearings have low cross sections but high radial load carrying capacity. This type has an outer ring, needle rollers, a cage and an inner ring.

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Thin-section bearings have small cross-sections with respect to diameter. They are designed to save space, lower the weight of a design and reduce friction. Some thin-section bearings are also referred to as torque tube bearings.

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The bearing industry uses a standard numbering system for bearings with metric-diameter bores. If the bore is hexagonal, enter the dimension across the flats. If the bore is tapered, enter the smaller diameter. For bore sizes 04 and up, multiply the bore size by 5 to identify the bore diameter in millimeters (mm). Refer to the table below.

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The bearing is tolerant of misalignment and has a greater load capacity than internal self-alignment, but requires more radial space.

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Many organizations have developed standards, including the American Bearing Manufacturers Association (ABMA), International Organization for Standardization (ISO) and the Deutsches Institut für Normung (DIN). ABEC and RBEC standards are defined by ABMA Standard 20. Similar standards are defined by ISO 492, JIS B1514 and DIN 620. ABEC bearing ratings were established by the Annular Bearing Engineering Committee (ABEC) of the American Bearing Manufacturers Association (ABMA). There are five classes of bearings in the ABEC rating system - 1, 3, 5, 7, and 9. The higher the ABEC rating, the tighter the tolerances and the higher the bearing precision. ABEC 1 bearings are designed for use in lower speed and accuracy applications. RBEC bearing ratings were established by the Roller Bearing Engineering Committee (RBEC) of the American Bearing Manufacturers Association (ABMA). There are five classes of bearings in the RBEC rating system - 1, 3, 5, 7, and 9. The higher the RBEC rating, the tighter the tolerances and the higher the bearing precision. RBEC ratings apply to cylindrical roller and spherical roller bearings. RBEC 1 bearings are designed for use in lower speed and accuracy applications. Although the specifications may differ slightly, the following equivalency can be made between ABMA, ISO and DIN bearing classes. ANSI Standard 20 / ISO 492 / DIN 620 ABEC 1 / Class Normal / P0 ABEC 3 / Class 6 / P6 ABEC 5 / Class 5 / P5 ABEC 7 / Class 4 / P4 ABEC 9 / Class 2 / P2

RBEC 9, Class 2 and P2 bearings are considered super precision and are designed for use in critical, high-tech applications.

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Class 000 (ABMA) and Class AA (ISO) bearings are the highest precision grade tapered roller bearings designed for use in critical, high-tech applications.

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